Third and Long - Written by Seth Fisher | Twitter: @sethAfisher13With Knowshon Moreno being out for even more time than he and the Dolphins thought previously, it has opened a competition that wasn't expected to be there. Lamar Miller is entrenched as the starter, but the third and fourth positions are completely open. Daniel Thomas, Mike Gillislee, Orleans Darkwa and Damien Williams are the four guys that are competing for the two spots.

We know enough about Daniel Thomas and Mike Gillislee, but who are these two undrafted rookies in Orleans Darkwa and Damien Williams? Let's take a look at what they did in college, what kind of running backs they are, and how they could contribute to the team this year and in the future.